Masking Layers

Masks perform a similar function as keyers, except you use masks to define the shape of transparent areas of layers. For more information, see Using Masks.

In the following example, a mask is used to isolate the subject in the foreground layer so it can be composited over the background layer.

To create a rectangular mask:

1. Import a front layer and a back layer into the current composite.
2. In the Workspace panel, arrange the front layer so that it is in front of the back layer, then select the front layer.



3. Choose Operators | Mask | Rectangular Mask.

The Rectangular Mask operator opens and a default size rectangle mask is added to the layer.



4. Click the Toolbar tab, and then click the Arrow tool .
5. In the viewport, use the bounding box to adjust the size and rotation of the mask. For information on sizing and rotating with a bounding box, see Editing Object Transform Properties.
6. Click the Modes button on the Mask Controls panel.
7. The Modes controls appear.



8. Set the mask Combine Mode to Replace.
9. If necessary, you can feather the mask edge. For more control over the feathering and softness, use egde gradients.



10. Click Invert to invert a mask or adjust the opacity slider to vary the mask's opacity.



11. Return to the composite to see the results of the masking operation: double-click the composite in the Workspace panel or click the Back button.